Headbox
CA 2000326 A1 · Owner: Voith (J.M.) G.M.B.H. · Inventors: Kade, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Headbox for the production of fibrous webs such as paper, Abstract of Disclosure, The invention relates to a headbox of the type having a machine-wide outlet duct which is bordered by two duct walls converging in the direction of flow to form an outlet slot at the downstream end. One of the two duct walls is pivoted at its upstream end so that the clear width of the outlet slot can be regulated by means of a lifting appliance. Along the exterior of the adjustable duct wall there extends parallel to the, outlet slot, a beam on which the movable duct wall is supported via a back-pressure cushion. The beam is movably fixed (preferably pivoted) independently of the movable duct wall (preferably …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 10, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.